.bg {  
     -fx-background-image: url("background.jpg") no-repeat;
     width: 100%;
     height: 800px;  
}  
.button{
    -fx-font-weight: 800;
    -fx-text-fill:#A312A1;
    -fx-opacity: 0.8;
    -fx-background-color: linear-gradient(#fff, #fff);
}

.button:hover {
    -fx-background-color: linear-gradient(#FAFD79, #85ED7E);
}
